#1254 Fix bug in SecondPiolaKirchhoff operator: a parameter no longer required was not properly removed for calls involvins an active stress policy.

#1232 Movemesh helper: fix a clang release warning (and modify slightly prototype to remove one additional parameter in release mode).

#2000 Model: make the type of MoReFEMData a template argument of the class. This was not done earlier to avoid making base Model a template class... but it has long become since a template class anyway, so it's better to use the possible extra leverage (next step is to store reference to the \a MoReFEMDataType and hence avoiding giving it as parameter in three of the class methods).

#1248 Extend integration test script to take into account Catch tests (which don't take Lua file as input in command line).

#1229 Solid: a negative tolerance now cancels the check that solid parameters are consistant with each other. Useful for some tests; should be avoided for genuine models.

#1237 Introduce MOREFEM_ROOT environment variable and use it in demo Lua files to indicate where to look for the mesh.

#1246 Test about Pk2 operator: introduce fixtures... just to separate clearly the tests, with printing on screen that explain what is tested.